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Wyszukujesz frazę "ship propulsion" wg kryterium: Temat


Tytuł:
Multi-source-supplied parallel hybrid propulsion of the inland passenger ship STA.H. Research work on energy efficiency of a hybrid propulsion system operating in the electric motor drive mode
Autorzy:
Kowalski, J.
Leśniewski, W.
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/259623.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hybrid ship propulsion
ship propulsion
Opis:
In the Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology, design has recently been developed of a small inland ship with hybrid propulsion and supply system. The ship will be propelled by a specially designed so called parallel hybrid propulsion system. The work was aimed at carrying out the energy efficiency analysis of a hybrid propulsion system operating in the electric motor drive mode and at performing the noise pollution measurements. The performed investigations have shown that a significant impact on the efficiency and on the acoustic emission has the type of belt transmission applied.
Źródło:
Polish Maritime Research; 2013, 3; 20-27
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waterjet propulsion of small-draught inland waterways ships
Autorzy:
Domachowski, Z.
Próchnicki, W.
Powiązania:
https://bibliotekanauki.pl/articles/260461.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hydromechanics
Opis:
This paper presents some aspects of ship waterjet propulsion. Advantages and limitations of its applicability are discussed. Also, possible use of waterjet propeller to move a small-draught inland waterways ship, is considered .
Źródło:
Polish Maritime Research; 2006, S 2; 66-71
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposal of ship gas-turbine driven waterjet propulsion - preliminary considerations
Autorzy:
Próchnicki, W.
Powiązania:
https://bibliotekanauki.pl/articles/962800.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hydromechanics
waterjet
Opis:
In the paper are presented preliminary considerations concerning the efficiency of waterjet ship propulsion system, as well as the calculation of main dimensions of waterjet channel. The friction and momentum losses of the flow channel have been roughly estimated by using Fliegner s equations. An important conclusion is confirmed that the summary losses are inversely proportional to square of ship velocity (~1/u2). On the other hand the ship propulsion power is directly proportional to third power of ship velocity (~u3). Therefore to minimize ship s hull resistance, hulls of water jet-driven ships ought to be of a great slenderness - e.g. L/B = 15, stabilized by sponsons, or of semi-swath hydrofoil-supported construction.
Źródło:
Polish Maritime Research; 2004, S 1; 79-82
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosing of ship propulsion elements by vibration measurement
Autorzy:
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/244654.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnosing
vibroacoustics
gas turbine engines
ship propulsion plantDiagnosing
ship propulsion plant
Opis:
In the present time the technical progress, make us use more and more complicated machines in our everyday life. The application of turbine engines as the main propulsion engines of a vessel impels, according to requirements, operation procedures. It alters considerably the usage of gas turbine engines in the navy from the ones in aviation. The relatively low load is characteristic to the operation of the marine engine. In the case of the technology used at sea, the necessity of highly specialized service is especially evident. In the paper, we present the diagnostic systems elaborated to support the exploitation of the vessel power plant with gas turbines. Application of computer simulation for diagnosing a technical state of gas turbines rotor sets should be applied during calculation and project process. During engine assembly, the rotating components are mounted with great care with the main objective of minimizing shaft unbalance. However, even with the best of care, such factors as machining imperfection, differential thermal expansion etc cause a small residual unbalance of gas turbine rotor. The dynamic problems of Marine Gas Turbine Engines are connected with such basic elements: rotors, bearings, struts of bearings, engine body and type of substructure. The proposed diagnostics method makes it possible to determine the limiting value of vibration symptoms .
Źródło:
Journal of KONES; 2011, 18, 1; 93-98
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case Study on the Unavailability of a Ship Propulsion System under Aging Effects and Maintenance
Autorzy:
Okazaki, T.
Powiązania:
https://bibliotekanauki.pl/articles/117350.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
vessel exploitation
unavailability of a ship propulsion system
ship propulsion
ship propulsion system
aging effects
ship maintenance
GO-FLOW
fuel consumption
Opis:
Unavailability of a ship propulsion system under aging effects and proper maintenance is estimated using GO-FLOW. GO-FLOW is an effective software tool for the unavailability analysis of complex systems. Aging effects are incorporated into GO-FLOW using a time-dependent technique and assuming a linear aging model. The results show that the aging effects and improper maintenance can potentially increase the frequency of accidents due to a malfunction of the propulsion system by a factor of three.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 3; 501-508
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic control systems for ships fitted with podded propulsion drive (POD)
Autorzy:
Dymarski, C.
Dąbrowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/962799.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
azimuthal propulsion
ship control systems
Opis:
The paper shows purposefulness and possiblity of automation of ship propulsion systems, especially those of POD type, intended to be used on four Baltic navigation ships: a containership, ro-ro ship, product tanker, as well as river-sea-going ship, designed within the frame of the Eureka "Baltecologicalship" project. Requirements of ship classification societies, and general ones for modern ship control systems were presented, as well as a review and analysis of currently applied power plant automation systems for diesel- electric ships fitted with podded propulsion drive (POD), were performed. Moreover real ways and possibilities of controlling ship s course and speed were indicated. Information contained in this paper may facilitate selecting appropriate design assumptions for a propulsion control system to be applied on the above mantioned ships.
Źródło:
Polish Maritime Research; 2004, S 1; 83-86
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosing elements of ship propulsion of vibration measurement
Autorzy:
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/243179.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnosing
vibroacoustics
gas turbine engines
ship propulsion plant Diagnosing
ship propulsion plant
Opis:
In the present time the technical progress make us use more and more complicated machines in our everyday life. In the case of the technology used at sea the necessity of highly specialised service is especially evident. The diagnostic systems elaborated to support the exploitation of the vessel power plant with gas turbines are presented in the paper. Application of computer simulation for diagnosing a technical state of gas turbines rotor sets should be applied during calculation and project process. During engine assembly, the rotating components are mounted with great care with the main objective of minimising shaft unbalance. However, even with the best of care, such factors as machining imperfection, differential thermal expansion etc cause a small residual unbalance of gas turbine rotor. The dynamic problems of Marine Gas Turbine Engines are connected with such basic elements as rotors, bearings, struts of bearings, engine body and type of substructure.
Źródło:
Journal of KONES; 2007, 14, 2; 81-89
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LNG as a marine fuel - possibilities and problem
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/242119.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine fuel
LNG
ship propulsion
Opis:
The limitations of marine fuels use incorporated sulphur on levels 4-5% for HFO and 0.5-1% for MDO were caused a necessity of possessing on ship a few types of fuel: conventional and with limited amount of sulphur. It is a necessary to separate the installation of different fuels caused that the ship fuel system are complicated. It is needed to change the fuel with time advance on areas with SOx controlled emissions (SECA areas) for example Baltic and North Sea. In the same time it is needed to change the engine adjustment in the aim of decreasing NOx emission. It allows for fulfilling the emission on tier 2 level (IMO regulations). It was announced for January 1st 2016 the time of tier 3 requirement of being in force. It is seemed to be impossible the fulfilling of that standard on marine liquid fuels (HFO and MDO). It was interested on gas fuels, especially on popular one the liquid natural gas (LNG). In the liquid state LNG is seemed to be an attractive marine fuel. It is remaining a problem of marine engines adaptation for burning that type of fuel in the aim of fulfilling the tier3 standard. At present, available dual fuel for marine diesel engines burn natural gas for ship operating reasons. Fulfilment these requirements needs an engine modernization or the alternative way is use of piston spark engines. There is an additional problem the assurance of repeatability of natural gas combustion process. During the change of engine load changes the fuel-air mixture composition, it is heterogeneous in the cylinder volume caused the ignition loss, the knocking combustion and the risk of out-of-control fuel self-ignition. The paper presents a probe of analysis these problems.
Źródło:
Journal of KONES; 2011, 18, 2; 169-176
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmentally friendly fuel system for liquefied gas carrier propelled with 45 MW main propulsion plant
Autorzy:
Górski, Z.
Cwilewicz, R.
Krysiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/246132.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
natural gas ship propulsion
COGES propulsion system
Opis:
This paper describes the problem of improvement in environment protection by application "environment friendly" fuel natural gas for ship propulsion. In thepaper the most suitable type of ship main propulsion system using natural gas was take into consideration. Propulsion using Iow speed diesel engine, medium speed diesel engine, steam turbine and combined systems were taken into consideration. As a result of analysis it was affirmed that COGES (Combined Gas Turbine and Steam Turbine Integrated Electric Drive System) is the most suitable propulsion plant to be fed with natural gas in contrary to ship diesel engines which adaptation to natural gas use still is in initial condition. COGES type propulsion plant consists in thermodynamic join of gas turbines and steam turbines. Ali turbines drive generators ofmain ship power station supplying simultaneously electric power to ship main propulsion electric motors and to ship electric network as well. It is suggested to use natural gas as fuel for gas turbines. Steam turbines are driven by steam produced in boilers warmed by gas turbines exhaust gases. This way a high efficiency of ship propulsion is obtained. The simplest source of natural gas is cargo carried by LNG (Liquefied Natural Gas) carriers. The preliminary project of such a carrier fuel system is presented in the paper. In addition conditions of application, advantages and disadvantages of natural gas fuel system are discussed.
Źródło:
Journal of KONES; 2010, 17, 1; 149-154
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of effectiveness of waterjet propulsor for a small underwater vehicle
Autorzy:
Rowinski, Lech
Kaczmarczyk, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2033211.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hydromechanics
waterjet
underwater vehicle
Opis:
The goal of the project described is to replace the existing propulsion system of a small underwater vehicle with a solution less prone to mechanical damage and ensuring a lower risk of the entanglement of fibrous objects suspended in the body of water. Four typical marine screws are utilised in the current design of the vehicle. One possible solution of the problem is the application of waterjet propulsors located inside the body of the vehicle instead. The general conditio of the application of the new solution was to secure at least the same motion control capabilities of the vehicle while the basic capability is its propulsion effectiveness at the required speed. Specific features of the considered waterjet propulsor, when compared with their application in surface vessel propulsion, are the lack of the head losses and the low significance of cavitation issues. One of the difficulties in the considered case is the small diameter of the propulsor in comparison to commercially available waterjet units, which have diameters between 0.1 [m] and 1.0 [m]. There is very little data regarding the design and performance of devices in the 0.02 to 0.05 [m] range. Methods utilised to forecast the performance of the new propulsion system are presented and results compared. These were semi-empirical calculations, numerical calculations and tests of real devices. The algorithm that is based on semi-empirical calculations is of particular interest while it offers possibility quick assessment of performance of a propulsor composed of several well defined components. The results indicate the feasibility of modification of the propulsion system for the considered vehicle if all the existing circumstances are taken into account.
Źródło:
Polish Maritime Research; 2021, 4; 30-41
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of main dimensions and estimation of propulsion power of a ship
Autorzy:
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/244443.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ship propulsion
Marine Power Plant
database
ship’ dimensions
Opis:
TEU number, which is the container ships’ crucial designing factor, directly influences the main hull dimensions such as displacement V , length L, breadth B, draught T, their combinations and block coefficient CB. The main dimensions have a great impact on developing the ships resistant performance. Thus, it is really fundamental to establish the correct dimensions of the hull during the design and ship building process. Estimating the shape of the ship’s hull, that comprises its main dimensions, is one of the basic tasks as part of the preliminary design stage. The most significant decisions determining ships performance, its duration and building costs are made at the beginning of the preliminary stage, when the costs are relatively low. It is important to limit the total ship resistance, for instance, by lowering the wave ship resistance as much as possible, especially when the operational speed and TEU number carried by one vessel is increasing. That resistance depends on the operational speed expressed by Froude number. The resistance criteria and the existing hull dimensions limits, resulting from ships route, must be taken into consideration bearing in mind safety conditions such as ships stability and seaworthiness, when the main ships dimensions are being determined. In the paper are presented general rules for calculations of ship’s hull principle dimensions and total power of engines of container ship 1300TEU and 18 kn at preliminary stage of design process.
Źródło:
Journal of KONES; 2014, 21, 2; 39-44
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis 0f characteristics of ship gas turbine propulsion system (in the light of the requirements for ship operation in the Baltic Sea)
Autorzy:
Domachowski, Z.
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/962803.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion system
gas turbines
environment protection
Opis:
The paper concerns a propulsion system of merchant ships intended for sailing in the Baltic Sea zone. Such system is to satisfy the ecological requirements determined by relevant international conventions for special zones to which the Baltic Sea also belongs. The paper draws attention to gas turbine used as a prime mover for such ships, because it satisfies the ecological requirements and has also other advantages. Application of gas turbine for ship powering does not require exhaust gas to be purified, however it requires fuel oils of a low sulphur content to be used. If the ecological rules impose the using of the fuel oils of similar quality for diesel engines then gas turbine propulsion system will be comparable - also economically (regarding specific fuel oil consumption cost) - with that of diesel engine. It would be even more favourable in a combine gas turbine /steam turbine system, especially at compound production of electric and heat energy (i.e. COGES systems). In the Baltic Sea zone gas turbines willfind application to powering a. o. such ships as : fast car-passenger ferries, fast cargo ships, special vehicles (hydrofoils, hovercraft, motor yachts).
Źródło:
Polish Maritime Research; 2004, S 1; 73-78
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for selection of parameters of ship propulsion system fitted with compromise screw propeller
Autorzy:
Michalski, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/260378.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
design of inland waterways ships
ship propellers
ship propulsion
Opis:
This paper concerns an algorithmic method for preliminary selection of parameters of ship propulsion system fitted with fixed screw propeller in the case when the ship’s operation is associated with significant changes of waterway depth and width, hull resistance of the ship and its service speed. Mathematical model arguments of the considered design problem are main ship design parameters identified in the preliminary design stage. Structure of the formulated model complies with formal requirements for continuous- discrete mathematical optimization problems. The presented examples of application of the method concern an inland waterways ship fitted with compromise screw propeller optimized in the sense of minimization of fuel consumption for passing a given route distance within a given time. The elaborated method may be especially useful in designing such ships as : coasters, inland waterways ships, tugs, pushers, trawlers, mine sweepers, icebreakers etc.
Źródło:
Polish Maritime Research; 2007, 4; 3-9
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two design concepts of power plant for an inland waterways passenger ship intended for operating on BERLIN – KALININGRAD route
Autorzy:
Bocheński, D.
Rudnicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/260447.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland waterways passenger ship
ship power plant
ship propulsion systems
Opis:
This paper presents two most probable design solutions of power plant for a two-segment passenger ship intended for operating on inland waterways of Poland, Germany and Russia. Preliminary designs of the main power plant to be installed on the pusher are presented, as well as requirements for the auxiliary power plant to be placed on the barge are outlined.
Źródło:
Polish Maritime Research; 2006, S 2; 52-56
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept design of diesel – hydraulic propulsion system for passenger ship intended for inland shallow water navigation
Autorzy:
Dymarski, Czesław
Powiązania:
https://bibliotekanauki.pl/articles/259998.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion systems
hydraulic drive and control
azimuthal propulsion systems
Opis:
This paper presents an analysis of environmental and technical conditions necessary for working out a possibly most favourable propulsion system for a two – segment passenger ship intended for navigation between Berlin and Kaliningrad. There are presented various types of propulsion systems for small ships as well as analyzed their possible applications and consequences. In this work there were taken into account system’s reliability, efficiency, dimensions, mass and costs of manufacturing, assembling and possible replacing the system components as well as an impact on maneuverability and natural environment. With taking into account the above mentioned criteria it was finally found that the diesel-hydraulic system fitted with two azimuthal ducted solid propellers is the most favourable. There are also presented a schematic propulsion and control diagram, three-dimensional arrangement drawing of system components as well as assembly drawing of the designed azimuthal propulsion system.
Źródło:
Polish Maritime Research; 2019, 3; 30-38
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economical analysis of selected variants of power plant for inland waterways passenger ship intended for operating on Berlin - Kaliningrad route
Autorzy:
Bocheński, D.
Powiązania:
https://bibliotekanauki.pl/articles/260439.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland waterways passenger ship
ship power plant
ship propulsion systems
Opis:
This paper contains an economical analysis of three selected variants of power plant for inland waterways passenger ship intended for operating on Berlin-Kaliningrad route. Purchase cost of elements of the ship’s energy system and fuel consumption cost were assumed as the assessment criterion for the analyzed variants of the ship’s power plant. The economical indices : Average Annual Cost (AAC) and Net Present Value (NPV) were taken into consideration.
Źródło:
Polish Maritime Research; 2006, S 2; 47-51
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficient and environmentally friendly hybrid conversion of inland passenger vessel
Autorzy:
Litwin, W.
Leśniewski, W.
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/259006.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hybrid propulsion
green shipping
zero emission
solar power
Opis:
The development and growing availability of modern technologies, along with more and more severe environment protection standards which frequently take a form of legal regulations, are the reason why attempts are made to find a quiet and economical propulsion system not only for newly built watercraft units, but also for modernised ones. Correct selection of the propulsion and supply system for a given vessel affects significantly not only the energy efficiency of the propulsions system but also the environment – as this selection is crucial for the noise and exhaust emission levels. The paper presents results of experimental examination of ship power demand performed on a historic passenger ship of 25 m in length. Two variants, referred to as serial and parallel hybrid propulsion systems, were examined with respect to the maximum length of the single-day route covered by the ship. The recorded power demands and environmental impact were compared with those characteristic for the already installed conventional propulsion system. Taking into account a high safety level expected to be ensured on a passenger ship, the serial hybrid system was based on two electric motors working in parallel and supplied from two separate sets of batteries. This solution ensures higher reliability, along with relatively high energy efficiency. The results of the performed examination have revealed that the serial propulsion system is the least harmful to the environment, but its investment cost is the highest. In this context, the optimum solution for the ship owner seems to be a parallel hybrid system of diesel-electric type.
Źródło:
Polish Maritime Research; 2017, 4; 77-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy analysis of the propulsion shaft fatigue process in a rotating mechanical system part III dimensional analysis
Autorzy:
Korczewski, Zbigniew
Marszałkowski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/1573606.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion shaft
dimensional analysis
Buckingham theorems
similarity criteria
Opis:
This article presents the third and last part of the problem of diagnosing the fatigue of marine propulsion shafts in terms of energy with the use of the action function, undertaken by the authors. Even the most perfect physical models of real objects, observed under laboratory conditions and developed based on the results of their research, cannot be useful in diagnostics without properly transferring the obtained results to the scale of the real object. This paper presents the method of using dimensional analyses and the Buckingham theorem (the so-called π theorem) to determine the dimensionless numbers of the dynamic similarity of the physical model of the propulsion shaft and its real ship counterpart, which enable the transfer of the results of the research on the energy processes accompanying the ship propulsion shaft fatigue from the physical model to the real object.
Źródło:
Polish Maritime Research; 2021, 2; 72-77
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of gas turbine controller adjustment on ship propulsion system behavior in rough sea conditions. Part 2. The simulation investigations
Autorzy:
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/259451.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion system
gas turbines
automatic control
sea waving
Opis:
The paper presents simulation investigations of influence of gas turbine controller adjuŹstment on ship propulsion system operating in heavy sea conditions, based on the model presented in Part 1 of the paper. The ship propulsion system with two gas turbines driŹving - through mechanical gear - ship controllable pitch propeller, described in Part 1, was used to analysis. The harmonic disturbances due to sea waves with selected frequencies were used as input function in computing the system’s amplitude characteristics at different settings of P and PD controllers.
Źródło:
Polish Maritime Research; 2004, 1; 15-23
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assisted propulsion device of a semi-submersible ship based on the magnus effect
Autorzy:
Lv, Jingze
Lin, Yiqun
Zhang, Rui
Li, Boyang
Hualin, Yang
Powiązania:
https://bibliotekanauki.pl/articles/32909218.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Flettner rotor
semi-submersible ship
wind energy
ship propulsion
numerical simulation
Opis:
The purpose of this study is to explore the potentiality of wind propulsion on semi-submersible ships. A new type of Flettner rotor (two rotating cylinders) system installed on a semi-submersible ship is proposed. The structure and installation of two cylinders with a height of 20 m and a diameter of 14 m are introduced. The numerical simulation of the cylinder is carried out in Fluent software. The influence of apparent wind angle and spin ratio on the two cylinders are analysed, when the distance between two cylinders is 3D-13D (D is cylinder diameter). When the distance between two cylinders is 3D, the performance of the system increases with an increase in spin ratio. Moreover, the apparent wind angle also has an effect on the system performance. Specifically, the thrust contribution of the system at the apparent wind angle of 120° is the largest at the spin ratio of 3.0. The maximum thrust reaches 500 kN. When the spin ratio is 2.5 and the apparent wind angle is 120°, the maximum effective power of the system is 1734 kW. In addition, the influence of the two cylinders distance on system performance cannot be ignored. When the distance between the two cylinders is 7D and the spin ratio is 2.5, the effective power of the system reaches a maximum, which is 1932 kW.
Źródło:
Polish Maritime Research; 2022, 3; 33-46
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of propeller emergence on hull, propeller, engine, and fuel consumption performance in regular head waves
Autorzy:
Ghaemi, Mohammad Hossein
Zeraatgar, Hamid
Powiązania:
https://bibliotekanauki.pl/articles/32898210.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship dynamics
ship propulsion system
propeller ventilation
propeller emergence
sea waves
Opis:
In this study, the impact of propeller emergence on the performance of a ship (speed), propeller (thrust, torque, and RPM), a diesel engine (torque and RPM) and fuel consumption are analysed under severe sea conditions. The goal is to describe the variation in the system variables and fuel consumption rather than analysing the motion of the ship or the phenomenon of propeller ventilation in itself. A mathematical model of the hull, propeller, and engine interactions is developed in which the propeller emergence is included. The system parameters are set using model experiments, empirical formulae, and available data for the engine. The dynamic response of the system is examined in regular head waves under submerged and emerged conditions of the propeller. The pulsatility and the extent of variation of 20 selected variables for the coupled system of hull, propeller, and engine are elaborated using quantitative and qualitative terms and absolute and relative scales. The simulation begins with a ship moving on a straight path, in calm water, with a constant speed for the ship, propeller and engine under steady conditions. The ship then encounters regular head waves with a known time series of the total resistance of the ship in waves. Large motions of the ship create propeller emergence, which in turn reduces the propeller thrust and torque. This study shows that for a specific ship, the mean ship speed, shaft angular velocity, and engine power were slightly reduced in submerged conditions with respect to calm water. We compared the mean values of the variables to those in the emerged condition, and found that the shaft angular velocity was almost the same, the ship speed was considerably reduced, and the engine power significantly dropped with respect to calm water. The ratios of the amplitude of fluctuation to the mean (Amp/Mean) for the ship speed and angular velocity of the shaft under both conditions were considerable, while the Amp/Mean for the power delivered by the engine was extremely high. The outcomes of the study show the degree of influence of propeller emergence on these variables. We identify the extent of each change and categorise the variables into three main groups based on the results.
Źródło:
Polish Maritime Research; 2022, 4; 56-76
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of a new type of Flettner rotor in merchant ships
Autorzy:
Li, Boyang
Zhang, Rui
Li, Yajing
Zhang, Baoshou
Guo, Chao
Powiązania:
https://bibliotekanauki.pl/articles/1573694.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
flettner rotor
wind energy
rotating cylinder
numerical simulation
Opis:
Wind energy is a clean and renewable source of energy. This study seeks to explore the potential for utilising wind power for merchant ships. A new type of Flettner rotor (rotating cylinder) mounted on the superstructure of a ship is proposed and numerically simulated. The construction and installation of the rotating cylinder is designed and a numerical simulation of the ship-mounted cylinder is carried out, using the commercially available CFD code Ansys Fluent to obtain parameters such as lift and drag coefficient of the cylinder in different conditions. Specifically, it is found that the cylinder type superstructure can play a certain role in reducing the effect of friction by comparing traditional and cylindrical superstructures; the rotating cylinder can generate auxiliary thrust for the ship. After analysis, the wind speed around the cylinder and spin ratio will have a direct influence on its thrust effect; there is an inflection point in the lift coefficient with the increase of α; the thrust coefficient (8.63) reaches the maximum environmental wind speed at 10 m/s and spin ratio is 2.5. For the rotating cylinder, the greater the environmental wind, the greater the thrust contribution generated under the same spin ratio conditions. The maximum thrust can reach 750,000 N; the cylinder’s auxiliary propulsion contribution shows a better advantage in α = 2.0. The effective power generated by the cylinder reaches a maximum of 2,240 kW for environmental wind speed = 20 m/s and α = 1.0.
Źródło:
Polish Maritime Research; 2021, 1; 28-41
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis of the effectiveness of ship propulsion devices
Autorzy:
Abramowicz-Gerik, T.
Powiązania:
https://bibliotekanauki.pl/articles/320536.pdf
Data publikacji:
2008
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
napędy okrętowe
modelowanie
siły hydrodynamiczne
ship propulsion
modelling
hydrodynamic forces
Opis:
The paper presents the study on the effectiveness of ship propulsion devices based on model tests conducted in the open water experimental set up. The influence of the water depth to draft ratio and distance from the vertical tight wall on the hydrodynamic forces generated by the propellers on the ship hull was investigated. The interaction effects observed for the twin propeller ship in bollard pull condition were compared with the effects induced by single propeller vessels available in literature and discussed with respect to the mathematical modelling of hydrodynamic forces generated on the hull by ship propulsion devices.
Źródło:
Annual of Navigation; 2008, 13; 5-13
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sighting through as part of shaft alignment procedure
Wyznaczanie linii odniesienia jako element procedury osiowania wałów
Autorzy:
Jarysz-Kamińska, E.
Powiązania:
https://bibliotekanauki.pl/articles/327712.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
wał
współosiowość
okrętowy układ napędowy
shaft
alignment
ship propulsion system
Opis:
This paper presents chosen activities of the ships propulsion system shafting alignment procedure. The main focus in this paper was put on sighting through (bore sighting) which can be done with three different types of measurement equipment: piano were, optical instruments and laser instruments. The analysis of measurement equipment allows selection of most optimal measurement solution for company. The matter of this selection is to avoid hazard to the shaft line due to shafts misalignment. Presented in paper measuring techniques and measurement equipment which is being used for sighting trough the elements of ships propulsion system meet technological requirements requested by the client and by the ship classification society.
W artykule przedstawiono zagadnienie procedury osiowania układu napędowego statku. Skoncentrowano się na ustawianiu bezpośrednim z wykorzystaniem trzech różnych przyrządów pomiarowych. Do pomiarów wykorzystano strunę stalową, urządzanie optyczne i urządzenie laserowe. Przedstawienie trzech różnych grup przyrządów pozwala na wybór najbardziej optymalnego rozwiązania dla przedsiębiorstwa. Istotą tego doboru jest uniknięcie zagrożenia dla linii wałów wynikającą z przekroczenia parametrów współosiowości. Omawiane techniki i przyrządy pomiarowe służące do bezpośredniego ustawiania elementów okrętowego układu napędowego spełniają wymagania technologiczne stawiane zarówno przez klienta jak i towarzystwa klasyfikacyjne.
Źródło:
Diagnostyka; 2010, 4(56); 65-68
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability, availability, and maintainability analysis of the propulsion system of a fleet
Autorzy:
Bayraktar, Murat
Nuran, Mustafa
Powiązania:
https://bibliotekanauki.pl/articles/24202522.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship propulsion system
reliability
availability
maintainability
RWB software
RAM analysis
Opis:
New systems are produced and developed to meet specific needs, and their reliability is the most important issue. In the maritime industry, evaluating failures in a ship’s propulsion system results in high costs and the loss of prestige for the company. Land/sea fleet employees need to detect and minimize the failures that may occur in ship propulsion systems in advance to ensure the continuity of the ships’ operations. In this study, the recorded failure data of four different ships belonging to a fleet in the last 10 years are used. Failures were examined as a whole since the ships have similar propulsion systems. The obtained failure data were grouped, and the average time to fix the failures was determined by the chief engineer and made suitable for reliability, availability, and maintainability (RAM) analysis. A suitable model was created for grouped failures by Isograph’s RWB software. As a result of the analysis of the propulsion system and its subsystems, the main engine of the ship was shown to have the best reliability. Furthermore, the most important components were the cylinders of the main engine as subsystems. This study highlights the components that are important to the reliability of a propulsion system. Thanks to the RAM analysis, improvements can be pinpointed on a ship’s propulsion system, which will increase the operations of the maritime industry. Reducing failures will further increase the confidence in maritime transport and strengthen its place among the modes of transportation. This study provides a valuable resource for academicians, experts, as well as companies working on reliability, availability, and maintainability in the future.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 70 (142); 63--70
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of nondimensional arguments in dimensional functions of ship propulsion engine operation
Autorzy:
Rosłanowski, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/246528.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ship propulsion engine operation dimensional analysis
dimensionless arguments in dimensional functions
Opis:
The following article describes different ways for determining dimensionless arguments in dimensional functions of ship propulsion engine operation. Dimensional space has also been characterized in relation to properties it possesses. An attention has been paid to the fact that it creates Abelian group, where involution fulfils multiplication axiom by scalar, and positive numbers that belong to dimensional space create dimensionless subspace. The conception of dimensional dependence has also been explained. There are also described conditions, which should be fulfilled by dimensional quantities to be dimensionally independent. Fundamental theorems of dimensional analysis have also been characterized. There is also given the definition of dimensional function of ship propulsion engine operation concerning values and dimensional arguments. It has been explained what requirements are to be fulfilled. One can also learn what limitations are imposed on dimensional function of ship propulsion engine operation concerning dimensional homogeneity and invariance. The ways of dimensional function transformation into a numerical one have been described. In addition, some conditions have been given which must be applied at given method of dimensional function transformation. An attention has been paid to the fact that dimensionless arguments are similarity invariant as a result of transformation by the similarity method of mathematical model of ship propulsion engine operation. In this study, the ship propulsion engine performance is expressed by product of Joule and second interpreted as transfer of energy in the form of work. Identification of ship propulsion engine operation by dimensional analysis performed in terms of its usefulness for diagnosis of ship propulsion engines. The basic problem of marine diesel exploitation is the monitoring of its technical condition. Diagnosis of marine diesel propulsion increases the safety of the ship and thus protects the marine environment against pollution.
Źródło:
Journal of KONES; 2015, 22, 2; 185-190
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subjective risk estimation of the rare event
Autorzy:
Nguyen, Hoang
Powiązania:
https://bibliotekanauki.pl/articles/241939.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
rare event
subjective risk estimation
intuitionistic fuzzy set
ship propulsion risk
Opis:
In the safety engineering, the most frequently disadvantage in risk estimation is the lack of data. In such cases, we have to rely on subjective estimations made by persons with practical knowledge in the field of interest, i.e. experts. However, in some realistic situations, they may have uncertainty in the perceiving and evaluation of the problem considered or limited knowledge of the rare events, such as the consequences of the seagoing ship propulsion failures. The probabilistic models of the risk estimation turn out to be insufficient in modelling the subjective uncertainty. The fuzzy methods are viewed to be powerful in dealing with ambiguity and uncertainty that can be used to handle with the subjective estimation. This article addresses the intuitionistic fuzzy method in the subjective estimation of the ship propulsion failure consequences as rare event risk. In the article, a subjective model of the ship propulsion risk is developed as scenarios of the different subsequent consequences of loss of ship propulsion function until a seriously severe accident resulting in loss of seaworthiness. The model proposes an approach combining AHP method and intuitionistic fuzzy method to assess the occurrence probability and severe probability of these rare events based on the expert opinions. In order to show the applicability of the proposed model, a study case of the propulsion risk of the container carrier operating on the North Atlantic lines is conducted.
Źródło:
Journal of KONES; 2019, 26, 1; 103-110
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of main engine power of seagoing ship at preliminary design stage
Autorzy:
Charchalis, A.
Krefft, J.
Powiązania:
https://bibliotekanauki.pl/articles/247536.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
seagoing ships
container vessels
preliminary design stage
ship's propulsion
main engine power
Opis:
Permanent growth of the container shipbuilding has led to the need of research - developing activities with references to design and ship building process. The requirements for the container vessels have been modified and changed compared with the ships built in the eighties of the past century. The ships capacity have been increased up to and even above 10 000 twenty feet containers (TEU) with the service speed above 25 knots. For such a giant sea going vessels with the overall length above 300 meters and draught above 10 meters the ship hull resistance characteristics have been modified. Those conditions bring to the situation where the propulsion power for the seagoing ships reached 80 MW. The estimation of the main engine power relation in the preliminary design stage is the main aim of the paper. The problem is such important as in that stage the most important design decisions with relatively low investment costs are determined. Moreover, the preliminary design stage distinguishes that the designer possesses just a few design parameters given by the ship owner of the future vessel. That is why the correct choice of the main engine power is difficult to determine. Determination of the main propulsion power impacts the electric and heat energy amount and the production way of both energy forms. The main engine equation has been determined based on the container ship's parameters for the entire range of container vessels load capacity (TEU). The values of the design parameters have came from author 's data base for the contemporary container vessels.
Źródło:
Journal of KONES; 2010, 17, 4; 89-95
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Step by Step Approach for Evaluating the Reliability of the Main Engine Lube Oil System for a Ships Propulsion System
Autorzy:
Anantharaman, M.
Khan, F.
Garaniya, V.
Lewarn, B.
Powiązania:
https://bibliotekanauki.pl/articles/116248.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Propulsion
Main Engine
Main Propulsion
Lubricating Oil System
Markov Analysis
reliability
Propulsion System
Engine Lube Oil System
Opis:
Effective and efficient maintenance is essential to ensure reliability of a ship's main propulsion system, which in turn is interdependent on the reliability of a number of associated sub- systems. A primary step in evaluating the reliability of the ship's propulsion system will be to evaluate the reliability of each of the sub- system. This paper discusses the methodology adopted to quantify reliability of one of the vital sub-system viz. the lubricating oil system, and development of a model, based on Markov analysis thereof. Having developed the model, means to improve reliability of the system should be considered. The cost of the incremental reliability should be measured to evaluate cost benefits. A maintenance plan can then be devised to achieve the higher level of reliability. Similar approach could be considered to evaluate the reliability of all other sub-systems. This will finally lead to development of a model to evaluate and improve the reliability of the main propulsion system.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 367-371
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody ograniczania emisji substancji gazowych i pyłowych na statkach śródlądowych
Methods for limiting emissions of exhoust emissions on inland waterway vessels
Autorzy:
Semenov, I. N.
Kaup, M.
Ignalewski, W.
Durajczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/134312.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
statek śródlądowy
paliwa alternatywne
napęd statku
inland waterway vessel
alternative fuels
ship propulsion
Opis:
Artykuł dotyczy problematyki ograniczania emisji substancji gazowych i pyłowych na statkach śródlądowych w związku z nowymi uregulowaniami prawnymi i technicznymi obowiązującymi na obszarze Unii Europejskiej. Jednym z kierunków spełnienia norm ochrony środowiska, w tym normy STAGE V, jest stosowanie paliw alternatywnych w napędach nowo budowanych statków śródlądowych lub stosowania instalacji ograniczających emisje szkodliwych substancji do atmosfery na statkach będących w eksploatacji kilkadziesiąt lat. Celem artykułu jest analiza wybranych rozwiązań napędowych i możliwości ich wdrożenia w najbliższych latach, aby dostosować tabor pływający do nowoczesnych wymagań technicznych oraz obniżyć ich koszty eksploatacji. W artykule przedstawiono dotychczas stosowane rodzaje napędów na jednostkach śródlądowych oraz uwarunkowania prawne określające warunki wdrażania paliw alternatywnych i stosowania technologii ograniczających emisje spalin. Przeanalizowano wybrane paliwa alternatywne oraz możliwości ich zastosowania w napędach statków śródlądowych. W ostatniej części rozpatrzono aspekt ekonomiczny zastosowania gazu naturalnego jako paliwa i jego wpływ na korzyści armatora statku śródlądowego.
The authors of the article raise the issue of limiting the emission of gaseous and dust substances on inland vessels in connection with new legal and technical regulations in European Union. One of the directions of meeting environmental protection standards, including STAGE V, is the use of alternative fuels in drives of newly built inland vessels or the use of installations limiting emissions of harmful substances to the atmosphere on vessels in operation for several decades. The aim of the article is to analyze selected drive solutions and the possibilities of their implementation in the coming years to adapt the fleet to the modern technical requirements and reduce their operating costs. The article presents hitherto used types of drives on inland units and legal conditions defining for the implementation of alternative fuels and the use of technologies limiting exhaust emissions. In addition, were analyzed selected alternative fuels and options for their use in inland waterway vessels. The last part deals with the economic aspect of the use of natural gas as a fuel and its impact on the benefits of the owner of an inland vessel.
Źródło:
Problemy Transportu i Logistyki; 2018, 44, 4; 85-94
1644-275X
2353-3005
Pojawia się w:
Problemy Transportu i Logistyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stopping of Ships Equipped with Azipods
Autorzy:
Nowicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/117172.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Azipods, Propeller
Stopping od Ships
Ship Propulsion
ship model
Stopping Tests
LNG Carrier
Stopping Manoeuvres
Opis:
The paper contains a description of different possibilities of stopping a large ship equipped with azipods. The model tests were carried out to compare the effectiveness of stopping the ship using the different methods. The ship model used in stopping tests reproduces a large LNG carrier of capacity ~150 000 m3.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 373-376
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The semi-Markov model of the process of appearance of sea-going ship propupsion system ability and inability states in application to determining the reliablity of these systems
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/259071.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
reliability
semi-Markov process
state of ability
state of inability
sea-going ship
ship propulsion system
Opis:
The article presents possible application of the theory of semi-Markov processes in creating the eight-state model of the process of appearance of the propulsion systems ability and inability states on sea-going vessels performing transportation tasks in a relatively long operating time t (t → ∞). The model has been proved to be able to be successfully used for determining the reliability of the abovementioned systems. The probability of faultless operation in time t was assumed the measure of system reliability. Operating situations of sea-going vessels were characterised, with special attention being paid to the fact that the loads of propulsion system components of these vessels are of random nature. These loads lead to damages which for this reason were also considered random events. It was also assumed that the damages provoke the appearance of states of inability of particular ship propulsion system components which means that these states are random events as well. The states of ability of a given ship propulsion system have been assumed to exist when all components of this system are in the state of ability. In case when at least one component is in the state of inability, the entire system is in the state of inability. Conditions were formulated for the reliability model of an arbitrary system to be able to be worked out in the form of the semi-Markov process. The need for the use of technical diagnostics in reliability examination of sea-going ship propulsion systems was indicated. In conclusions, certain qualities of the article were highlighted which are, in author’s opinion, of highest importance in reliability examination of sea-going ship propulsion systems.
Źródło:
Polish Maritime Research; 2013, 4; 18-24
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for estimating propulsion risk of the ship casualty
Autorzy:
Nguyen, N.
Powiązania:
https://bibliotekanauki.pl/articles/242339.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
estimation
expert judgment
risk
ship propulsion system
analytic hierarchy process (AHP)
sea transport
Opis:
Loss of the propulsion function by a ship is one of the most serious categories of hazardous events in sea transport. In specific external conditions it may lead to a loss of ship and environmental pollution. The consequences of propulsion loss by a ship are events classified by the International Maritime Organization as casualties or incidents. The probabilities of occurrence of the former events in a specific time unit constitute the propulsion risk of a ship. Determination of these probabilities is in practice confronted with difficulties connected with shortage of data. A method for estimating the risk caused by loss of a seagoing ship propulsion function is proposed. The estimation is fully based on the expert judgments. Expert is assumed to be well acquainted with the subject he is expected to formulate his judgment on. Expert should also be capable of formulating his judgment. This is connected with level of his education and the language used in the elicitation process, particularly as regards the parameters the expert is expected to estimate. This may be the language of numerical or linguistic values. Numerical values are better but are more difficult to articulate - also errors in judgments are more likely. To overcome this problem and to obtain a more accurate estimation, this study suggests using an analytic hierarchy process (AHP), which quantifies the subjective judgments and confirms the consistency of collected data. An example of the propulsion risk estimation of container carriers operating on the North Atlantic line allows to assess effectiveness of the method.
Źródło:
Journal of KONES; 2013, 20, 2; 315-321
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance and emission modelling and simulation of marine diesel engines using publicly available engine data
Autorzy:
Ghaemi, Mohammad Hossein
Powiązania:
https://bibliotekanauki.pl/articles/2033202.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine diesel engine
mathematical model
Mean-Value Model
simulation of ship propulsion system
Opis:
To analyse the behaviour of marine diesel engines in unsteady states for different purposes, for example to determine the fuel consumption or emissions level, to adjust the control strategy, to manage the maintenance, etc., a goal-based mathematical model that can be easily implemented for simulation is necessary. Such a model usually requires a wide range of operating data, measured on a test stand. This is a time-consuming process with high costs and the relevant data are not available publicly for a selected engine. The present paper delivers a rapid and relatively simple method for preparing a simulation model of a given marine diesel engine, based only on the widely available data in the project guides indicated for steady state conditions. After establishing the framework of the mathematical model, it describes how the parameters of the model can be adjusted for the simulation model and how the results can be verified as well. Conceptually, this is a trial and error method, but the presented case example makes clear how the parameters can be selected to reduce the number of trials and quickly determine the model parameters. The necessary descriptions are given through a case study, which is the MAN-B&W 8S65ME-C8 marine diesel engine. The engine is assumed to be connected to a constant pitch propeller. The presented mathematical model is a mean-value zero-dimensional type with seven state variables. The other variables of the engine are determined based on the state independent variables and the input value, which is the fuel rate. The paper can be used as a guideline to prepare a convenient mathematical model for simulation, with the minimum publicly available data.
Źródło:
Polish Maritime Research; 2021, 4; 63-87
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on MDO of ship propulsion shafting dynamics considering the coupling effect of a propeller-shafting-hull system
Autorzy:
Liu, Jinlin
Gu, Zheng
Liu, Shuyong
Powiązania:
https://bibliotekanauki.pl/articles/32916294.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion shafting
dynamic modelling
shafting alignment
shafting vibration
multi-disciplinary design optimisation
Opis:
Dynamic designs for ship propulsion shafting can be categorised as complex multi-disciplinary coupling systems. The traditional single disciplinary optimisation design method has become a bottleneck, restricting the further improvement of shafting design. In this paper, taking a complex propulsion shafting as the object, a dynamic analysis model of the propeller-shafting-hull system was established. In order to analyse the coupling effect of propeller hydrodynamics on shafting dynamics, the propeller’s hydrodynamic force in the wake flow field was calculated as the input for shafting alignment and vibration analysis. On this basis, the discipline decomposition and analysis of the subdisciplines in design of shafting dynamics were carried out. The coupling relationships between design variables in the subdisciplines were studied and the Multi-disciplinary Design Optimisation (MDO) framework of shafting dynamics was established. Finally, taking the hollowness of the shaft segments and the vertical displacement of bearings as design variables, combined with the optimal algorithm, the MDO of shafting dynamics, considering the coupling effect of the propellershafting-hull system, was realised. The results presented in this paper can provide a beneficial reference for improving the design quality of ship shafting.
Źródło:
Polish Maritime Research; 2023, 1; 86-97
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ship’s operational speed on the planned ocean route in real weather conditions
Autorzy:
Szelangiewicz, Tadeusz
Żelazny, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/27315876.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
ocean route
ship speed
weather parameters
ship propulsion
trasa oceaniczna
prędkość statku
parametr pogodowy
napęd statku
Opis:
While operating the ship, one of the most important tasks is forecasting the ocean route. For this purpose, the speed characteristics of the ship are used, which are used in specialized computer systems and presented in publications. However, published algorithms for speed (or decrease of speed) calculations of a ship in real weather conditions on given routes are very simplified and do not contain all the relevant parameters related to the ship's hull (affecting its resistance when sailing, eg on waves), its propulsion and weather conditions. The article presents its own, more detailed mathematical model of the speed of the ship, and the performed calculations of speed of the ship were compared with the algorithms available in the literature and with the records from the ship's log.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 159-166
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prognozowanie charakterystyk napędowych statku ze śrubą stałą podczas pływania w zmiennych warunkach pogodowych
Prediction of Propulsion Performance of a Ship with Fixed-Pitch Propeller in Variable Weather Conditions
Autorzy:
Szelangiewicz, T.
Żelazny, K.
Powiązania:
https://bibliotekanauki.pl/articles/359720.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
charakterystyki napędowe statku
praca napędu w zmiennych warunkach pogodowych
EXPLO-SHIP 2004
ship propulsion characteristics
propulsion operation in variable weather conditions
Opis:
Przedstawiono algorytm umożliwiający numeryczne obliczanie charakterystyk napędowych statku. Charakterystyki te uzupełniono o wykresy całkowitego oporu w określonych warunkach pogodowych. Podano różne możliwości wyboru punktu pracy układu napędowego w zależności od przyjętych kryteriów.
The article presents an algorithm for the numerical calculation of ship propulsion characteristics. The propulsion characteristics were completed with total resistance charts for given weather conditions. Alternative choices of the propulsion working point depending on assumed criteria were discussed.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 1 (73); 489-498
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative components importance analysis of a complex technical system with the use of different importance measures
Analiza porównawcza ważności elementów systemu technicznego z jednoczesnym wykorzystaniem różnych miar ważności
Autorzy:
Chybowski, L.
Idziaszczyk, D.
Wiśnicki, B.
Powiązania:
https://bibliotekanauki.pl/articles/112937.pdf
Data publikacji:
2014
Wydawca:
STE GROUP
Tematy:
importance measures
comparative analysis
ship propulsion system
miara ważności
analiza porównawcza
okrętowy układ napędowy
Opis:
This paper presents a components importance analysis of a complex technical system with the use of selected reliability components importance measures. The analysis was carried out on a propeller shaft stern tube seal of a ship propulsion system. The reliability structure of the analyzed system was modeled by means of the fault tree. For given system components the following were determined: the Birnbaum’s reliability and structural importance measure, reliability improvement potential, criticality measure and Vesely-Fussell’s measure. A transformation of measures based on rescaling their values has been proposed to simplify the comparative analysis using different measures with reference to the same system components. A transformation process for the analyzed system has been presented together with a results visualization of comparative components importance analysis by means of 3D bar charts and radar charts for a data series determined as system components and importance measures. Comments on the proposed methodology have been presented and other ways of its application have been indicated.
W artykule przedstawiono analizę ważności elementów złożonego systemu technicznego z wykorzystaniem wybranych niezawodnościowych miar ważności elementów. Analizę przeprowadzono na przykładzie systemu smarowania i uszczelnienia pochwy wału śrubowego układu napędowego statku. Strukturę niezawodnościową analizowanego systemu zamodelowano z wykorzystaniem drzewa niezdatności. Dla poszczególnych elementów systemu wyznaczono niezawodnościową miarę ważności Birnbauma, miarę strukturalną Birnbauma, Potencjał przyrostu niezawodności, miarę krytyczności oraz miarę Veseley-Fussell’a, Zaproponowano transformację miar polegająca na przeskalowaniu ich wartości w celu ułatwienia analizy porównawczej wykorzystującej różne miary w odniesieniu do tych samych elementów systemu. Przedstawiono dla analizowanego systemu proces transformacji oraz zaprezentowano wizualizację wyników analizy porównawczej ważności elementów z wykorzystaniem wykresów słupkowych 3D oraz wykresów radarowych dla serii danych ustalonych jako elementy systemu oraz jako miary ważności. Przedstawiono uwagi dotyczące zaproponowanej metodyki i wskazano inne możliwe jej zastosowania.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2014, 1 (7); 23-33
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coefficients of Propeller-hull Interaction in Propulsion System of Inland Waterway Vessels with Stern Tunnels
Autorzy:
Kulczyk, J.
Tabaczek, T.
Powiązania:
https://bibliotekanauki.pl/articles/117051.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Propulsion System
Inland Waterway Vessel
Stern Tunnels
Ship Propulsion
Propeller-Hull Interaction
Hydrodynamics
ANSYS Fluent
hull efficiency
Opis:
Propeller-hull interaction coefficients - the wake fraction and the thrust deduction factor - play significant role in design of propulsion system of a ship. In the case of inland waterway vessels the reliable method of predicting these coefficients in early design stage is missing. Based on the outcomes from model tests and from numerical computations the present authors show that it is difficult to determine uniquely the trends in change of wake fraction and thrust deduction factor resulting from the changes of hull form or operating conditions. Nowadays the resistance and propulsion model tests of inland waterway vessels are carried out rarely because of relatively high costs. On the other hand, the degree of development of computational methods enables’ to estimate the reliable values o interaction coefficients. The computations referred to in the present paper were carried out using the authors’ own software HPSDKS and the commercial software Ansys Fluent.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 377-384
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficient small inland passenger shuttle ferry with hybrid propulsion - concept design, calculations and model tests
Autorzy:
Kunicka, Magdalena
Litwin, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/259786.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship hybrid propulsion
energy efficiency
green shipping
energy management
Opis:
In recent years, there has been a significant development in “green” and energy efficient propulsion systems, which fits into the general trend of environmentally friendly “green shipping”. The pursued goal is to construct a safe passenger ship that is low in energy demand and equipped with a highly energy efficient, emission-free propulsion system. The paper presents main problems encountered by designers of a small, hybrid-powered ferry powered lithium batteries. The conducted research allowed to create a design of an energy efficient hull shape, which decreases the demand for energy. Completed remote control model tests resulted in a proposal of an energy efficient and safe propulsion system with good manoeuvring capabilities. Measurements completed on an existing ferry permitted completing energy balance and forming an energy management policy. The paper contains the emission calculations computed for the existing ferry that are necessary for the environmental impact analysis. The soon to be constructed, newly designed vessel will provide a valuable contribution to hybrid-propulsion, energy management and unmanned technologies research.
Źródło:
Polish Maritime Research; 2019, 2; 85-92
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charging station location optimization of electric ship based on backup coverage model
Autorzy:
Zhang, W.
Yan, X.
Zhang, D.
Powiązania:
https://bibliotekanauki.pl/articles/117632.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
main engine
ship propulsion
charging station
electric ship
backup coverage model
electric ship energy
electric energy supply
ship charging station
Opis:
In terms of electric ship energy requirement in navigation, the ship charging station location is especially important. In this paper, a multi-period ship charging station location optimization model is pro-posed to make location decision in overall, from initial possible station sites chosen to the capacity determination for the final location sites. In the first phase, from the perspective of external environment, find out all possible ship charging station candidate sites through the feasible analyze. In the second phase, taking the ship charging demands into consideration, the final ship charging station sites can be selected among the candidate sites based on backup coverage model. In the last phase, regarding the cost of construction and service capability for different grade as the main factor in capacity determination, the optimal capacity of each final ship charging station are determined by means of optimization method. Finally, an example of Yanqi lake in China is used to verify the validity of the proposed methodology. The reasonable location of charging station could ensure the electric energy supply and avoid congestion caused by ship charging gathering. The model can be easily generalized to other problems regarding facility allocation based on user demand.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 2; 323-327
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of measuring equipment in assembly process - analysis of selected elements
Dobór wyposażenia pomiarowego w procesach montażowych - analiza wybranych elementów
Autorzy:
Jarysz-Kamińska, E.
Powiązania:
https://bibliotekanauki.pl/articles/327994.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
wyposażenie pomiarowe
właściwości metrologiczne
okrętowy układ napędowy
measuring equipment
metrological characteristics
ship propulsion system
Opis:
The paper presents function of selection of measuring equipment - DWP function. Analysis of the individual elements of described the function can be used for isolation the most important measurement components of the selection of measuring equipment for selected measurement processes. The paper shows one chosen element of function of selection of measuring equipment - metrological characteristics. Those characteristics are shown on the example of chosen measuring equipment which is used in the alignment deviation measurements carried out during the assembly of elements of the ships propulsion system.
W artykule przedstawiono funkcję doboru wyposażenia pomiarowego - funkcja DWP. Analiza poszczególnych elementów przedstawionej funkcji może służyć wyodrębnieniu najistotniejszych składników doboru wyposażenia pomiarowego dla wybranych zadań pomiarowych. W artykule zobrazowano jeden z elementów funkcji doboru wyposażenia pomiarowego - właściwości metrologiczne. Charakterystyki te przedstawiono na przykładzie wyposażenia pomiarowego wykorzystywanego w trakcie pomiarów odchyłki współosiowości realizowanych w trakcie montażu elementów okrętowego układu napędowego.
Źródło:
Diagnostyka; 2011, 3(59); 47-52
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical evaluation of propriety of measurements of ship’s movement parameters
Autorzy:
Charchalis, A.
Polanowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/244984.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnostics
vessel’s propulsion systems
ship propulsion characteristics for ships with fixed propeller modelling
determination of power characteristics
Opis:
The paper presents some problems of carrying out measurements of energetic characteristics and vessel’s performance in the conditions of sea examinations. As the object of propulsion characteristic determination was selected the ship with fixed pitch propeller. In order to formulate models of power characteristics, in first, known physical aspect were taken and subsequently statistic theory was implemented. Models of propulsion performance were built basing on two theoretical methods of determination of required shaft power and torque at a hub, as the function of propeller’s revolutionary speed and sailing condition represented by dimensionless coefficients. Model number one, based on Silukov method presents function with variable power index, of shaft power in domain of revolutionary speed. The second one presents model of torque variations, based on Silovic – Fancev method. For verification of models were taken presented in available bibliography, results of researches of ship’s propulsion systems [6]. We also discuss the manner of reducing the results of measurements to the standard conditions. We present the way of preparing propulsion characteristics and the analysis of examination uncertainty for the measurement of torque. Statistical analysis of deviation of results, using three models, proposed in the paper. As a result of analysis, one point from primary data set was rejected due to its unreliability, what was resulting with higher adequacy of characteristics.
Źródło:
Journal of KONES; 2016, 23, 1; 83-89
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recommendations for Training of Crews Working on Diesel-Electric Vessels Equipped with Azimuth Thrusters
Autorzy:
Pipchenko, O. D.
Tsymbal, M.
Shevchenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/116343.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
diesel-electric vessels
azimuth thrusters
crew training
ship propulsion
power plant system
azimuth propulsion
risk matrix
emergency steering
Opis:
This study addresses the problem of training the officers, which are assigned to an electrical-driven vessels equipped with azimuth thrusters. A pair of omnidirectional thrusters in combination with power plant system containing several diesel generators imply a potential for a variety of different emergency scenarios, which also includes partial or full loss of control or blackout. These fault scenarios were classified in the article with predefined risk levels depending on the area, time limitation, mode of operation and fault itself. Mutual responsibilities and action algorithms for bridge and engine teams in a step-by-step manner have been developed for each scenario. Personnel behavioral differences in both expected and unexpected emergencies have also been studied.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 567-571
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of overall ship fuel consumption in acceleration manoeuvre using hull-propeller-engine interaction principles and governor features
Autorzy:
Zeraatgar, Hamid
Ghaemi, M. Hossein
Powiązania:
https://bibliotekanauki.pl/articles/258468.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
modelling and simulation
fuel consumption
hull-propeller-engine interactions
ship propulsion system
governor
control strategy
Opis:
The problem of reduction of greenhouse gas emissions in shipping is currently addressed by many research works and related industries. There are many existing and visionary technologies and ideas, which are conceptually defined or practically realised. This goal can be achieved in different ways, and reducing fuel consumption is one of the major methods. In these circumstances, the aim of this study is to analyse the possibility of fuel consumption reduction by using an alternative control strategy for low-speed marine diesel engines which would take into account the interactions between hull, propeller and main engine. For this purpose, a mathematical model including ship hull and propulsion system is developed. A case study is conducted for a ship for which the results of both the ship hull and screw propeller model tests are available. A low-speed two-stroke diesel engine is then selected for the considered ship. Two different governors are included in the model and their parameters are changed to investigate the dynamic behaviour of the system when simulating the forward acceleration mode in calm sea conditions. The research is mainly focused on variations of fuel consumption by the ship passing a certain distance to reach the nominal constant speed. It is concluded that, for a given travel distance, it is possible to save considerable amount of fuel at the expense of slight increase of journey time.
Źródło:
Polish Maritime Research; 2019, 1; 162-163
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The microprocessor device for measurements of torque and rotational speed on the propeller shaft of ship
Urządzenie do pomiaru momentu i prędkości obrotowej na wale śruby napędowej statku
Autorzy:
Morawski, L.
Szuca, Z.
Powiązania:
https://bibliotekanauki.pl/articles/158019.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
okrętowy układ napędowy
silnik napędu głównego
pomiar momentu
momentomierz
ship's propulsion unit
main engine
torquemeter
Opis:
The paper presents the new model of torque meter designed in Gdynia Maritime University and Research-Production Enterprise for Maritime Industry "ENAMOR" Ltd., Gdynia. The general idea of measurement makes use of the torsion angle measured on a shaft section (400 mm) using the photo-optical technique. Torque meter unit is equipped with Programmable Logic Device (PLC) for calculations, external parameters acquisition (ex.: speed, trim, shaft generator power etc.) and measured data storage in memory. This unit (bearing a symbol ETNP-8) has also possibility to measure instantaneous fluctuations of the torque and engine rotational speed as a function of the shaft rotation angle. Displaying time-histories of those parameters on the monitor screen of an external PC computer gives the operator an opportunity to make a preliminary performance assessment for each individual cylinder in the engine, and for the drive system as a whole. As an example, the analysis and processing of the measured torque and rotational speed fluctuations are presented. The measurements were done on the training ship m/s Horyzont II, owned by the Gdynia Maritime University.
Referat przedstawia urządzenie do pomiaru momentu i prędkości kątowej na wale śruby, wykorzystujące fotooptyczny pomiar kąta skręcenia wału. Na podstawie mierzonych czasów trwania zębów i szczelin dwóch tarczy zębowych wyznaczana jest prędkość obrotowa, moment i moc na wale oraz teoretyczne zużycie paliwa. Dołączony do urządzenia zewnętrzny komputer PC, z odpowiednim oprogramowaniem umożliwia pomiar wartości chwilowych momentu i prędkości obrotowej w funkcji kąta położenia wału korbowego. Pomiary wartości chwilowych zawierają informację diagnostyczną o pracy układu napędowego statku.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 12, 12; 5-7
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Model of Ship Propulsion Systems Operating Process
Model procesu eksploatacji układu napędowego statku
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/360243.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
proces eksploatacji
proces semimarkowski
układ napędowy statku
EXPLO-SHIP 2004
operation process
semi-Markov process
ship propulsion system
Opis:
The paper contains a formal description of ship propulsion systems operation process. The model of the process is presented in the form of two-dimensional stochastic process of which coordinates are semi-Markov processes of the final states set. The former process describes the process of changes in technical states of ship propulsion systems, the latter - the process of changes in their operating states. A monovariate model of ship propulsion systems operation process has also been proposed.
Podano opis formalny procesu eksploatacji układów napędowych statków. Model tego procesu przedstawiono w formie dwuwymiarowego procesu, którego współrzędnymi są procesy semi-Markowa o skończonych zbiorach stanów. Jeden z tych procesów jest procesem zmian stanów technicznych układów napędowych a drugi - procesem zmian ich stanów eksploatacyjnych. Zaproponowano także jednowymiarowy model procesu eksploatacji układów napędowych statków.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 1 (73); 211-220
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model for predicting the ship speed in the actual weather conditions on the planned ocean route
Autorzy:
Szelangiewicz, Tadeusz
Żelazny, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/27315862.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
ocean route
ship speed
wind
current
wave
ship propulsion
trasa oceaniczna
prędkość statku
wiatr
prąd
fale
siłownie okrętowe
Opis:
While operating the ship, one of the most important tasks is forecasting the ocean route. The vessel's speed characteristics are used to predict the route. Commonly used are very simplified algorithms for calculating those characteristics in which only a few basic ship parameters are used. The article presents a more detailed mathematical model for forecasting the speed of the ship in real weather conditions. This model requires more detailed geometric data of the ship and its propulsion (propeller and propulsion engine), but this data is available for operating ships.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 105-112
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vessel main propulsion engine performance evaluation
Autorzy:
Borkowski, T.
Kowalak, P.
Myśków, J.
Powiązania:
https://bibliotekanauki.pl/articles/247310.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ship main propulsion
marine diesel engine
Energy Efficiency Design Index
Opis:
In general, the performance of a ship in service is different from that obtained on shipyard sea trial. Apart from any differences due to loading conditions, and for which due correction should be made, these differences arise principally from the weather, fouling and surface deterioration of the hull and propeller. The influence of the weather, both in terms of wind and sea conditions, is an extremely important factor in ship performance analysis. Consequently, the weather effects needs to be taken into account if a realistic evaluation is to be made. The primary role of the ship service analysis is a standard of performance data, under varying operational and environmental conditions. The resulting information, derived from this data, becomes the basis for operational and chartering decision. In addition, the part for the data records is to enable the analysis of trends of either the hull or machinery, from which the identification of potential failure scenarios and maintenance decisions can be derived. The traditional method of data collection is the deck and engine room log records, and this is the most commonly used method today. In terms of data processing and capabilities, this method of data collection is far from ultimate, since involves significant data distortion risk. Instrumentation errors are always a potential source of concern in performance analysis methods. Such errors are generally in the form of instrument drift or gross distortion of the reading. However, these can generally be detected by the use of trend analysis techniques. The procedure for the evaluation of the ship's service performance, that relies on proven methods of main propulsion engine service data analysis used and applied for container vessel - small feeder. The vessel is equipped with indirect main propulsion, driven by means of modern medium speed engine. The different approach demonstrated to achieve the reliable and accurate main engine performance. The difference in developed engine power has been found, that corresponds well to registered sea trial results and engine retrofitting reports done, in order to limit the effective power.
Źródło:
Journal of KONES; 2012, 19, 2; 53-60
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development of specialized ships propulsion systems with the aim of improving their manoeuvring ability in the aspect of navigation safety
Rozwój układów napędowych specjalistycznych statków w celu podniesienia ich zdolności manewrowych w aspekcie bezpieczeństwa żeglugi
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/243414.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
statek specjalistyczny
układ napędowy
pędnik
zdolności manewrowe
bezpieczeństwo żeglugi
specialized ship
ship propulsion system
thruster
manoeuvring ability
navigation safety
Opis:
The paper presents the development of specialized ship's propulsion system during last twenty years. It was shown some applied solutions of propulsion systems and what aims were achieved: improving of manoeuvring ability, the achievement ofpropulsion system's high efficiency in very large range from the idling to full load and the increasing of navigation safety. Ship propulsion systems are more often applied, especially for ships which operate on the sea in special ways and need: ship positioning, very high manoeuvring abilities, other ships services, self manoeuvring even for cruise ships. These propulsion systems are not needed applying the steering gears. These functions: steering and propulsion do thrusters, which in these cases are built in twin systems. It ensures possibilities of ship's propulsion (motion) keeping, even in case of failure in one propulsion system. For reason of sea traffic increasing, especially on sea area, when this traffic needs co-ordination (VTS stations), ship equipped in modern propulsion system should ensure greater navigation safety for herself and should decrease collision risk for other ships situated on this sea area. The usage high-performance and efficiency active powerplants is a key for the enlargement of the safety of sea shipping.
W artykule przedstawiono rozwój układów napędowych specjalistycznych statków w okresie ostatnich dwudziestu lat. Podano stosowane rozwiązania oraz jakie cele udało się osiągnąć: zwiększenie zdolności manewrowych jednostek, uzyskanie wysokiej sprawności układów napędowych w szerokim zakresie obciążeń od biegu jałowego do obciążenia nominalnego oraz podniesienie bezpieczeństwa żeglugi. Układy napędowe z nowoczesnymi pędnikami są coraz powszechniej stosowane, szczególnie dla statków, które uprawiają nietypowążeglugę i wymagają: pozycjonowania jednostki, wysokich zdolności manewrowych, obsługi innych statków, samodzielnego manewrowania nawet w przypadku dużych statków pasażerskich. Układy te nie wymagają stosowania tradycyjnych maszyn sterowych. Funkcje sterowania i napędu jednostki spełniają pędniki, które z tego powodu budowane są minimum w układach podwójnych. W związku ze zwiększaniem się ruchu morskiego, szczególnie na akwenach, na których ruch ten wymaga koordynacji (stacji kierowania ruchem), statek posiadający nowoczesny układ napędowy będzie w stanie zapewnić bezpiecznążeglugę dla siebie i zmniejszyć zagrożenie kolizyjne w stosunku do wszystkich jednostek znajdujących się na danym akwenie. Stosowanie wysokosprawnych pędników aktywnych jest kluczem do zwiększenia bezpieczeństwa żeglugi.
Źródło:
Journal of KONES; 2007, 14, 3; 211-218
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł

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